Water developable, negative working overlay color proofing system utilizing water soluble polymeric diazonium compound; water insoluble, water swellable binder resin; and a colorant

ABSTRACT

This invention relates to water developable, negative working photosensitized sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to predict the image quality from a lithographic printing process. The invention provides both overlay and transfer type proofing sheets which have good fingerprint resistance.

CROSS REFERENCE TO RELATED APPLICATIONS

This is a divisional of copending application(s) Ser. No. 07/679,361filed on Apr. 2, 1991, now U.S. Pat. No. 5,212,041, granted May 18, 1993which is a continuation-in-part of Ser. No. 07/431,257 filed on Feb. 12,1990, now abandoned; which is a divisional of Ser. No. 07/183,841 filedApr. 20, 1988, now U.S. Pat. No. 4,914,039 issued Apr. 3, 1990.

BACKGROUND OF THE INVENTION

The present invention relates to an improved overlay or transfer type ofnegative working color proofing system which is developable with wateralone. It has long been desired in the art to produce color proofingsystems which are water developable. Water developability rendersdeveloper effluent more ecologically acceptable and provides a lesshazardous working environment. Water developable color proofing systemsare known in the art. These typically employ a combination of certainwater soluble diazonium salts in conjunction with water soluble binderresins. While such materials are truly water developable, they aredisadvantageous because fingerprint resistance is low. This inventionimproves upon such prior systems such as taught in U.S. Pat. No.4,469,772 which specifies a combination of the methane sulfonate andmesitylene sulfonate salts and a water soluble resin binder. The presentinvention provides a combination of a water soluble diazonium salt and awater insoluble but water swellable resin binder.

In the field of reprographics, it is desirable to produce a color proofto assist a printer in correcting a set of photomasks which will be usedin exposing printing plates. The proof should reproduce the colorquality that will be obtained during the printing process. The proofmust be a consistent duplicate of the desired half tone or line image,and should neither gain nor lose color. Visual examination of a colorproof should reveal any defects on the photomask; the best colorrendition to be expected from press printing of the material; thecorrect gradation of all colors and whether grays are neutral; and theneed, if any, for subduing any of the colors and/or giving directionsfor altering the film photomask before making the printing plates.

Color proofing sheets for multicolored printing have heretofore beenmade by using a printing press proof which requires taking all the stepsnecessary for actual multicolor printing. Such a conventional method ofcolor proofing has been costly and time consuming. Alternate colorproofing methods have therefore been developed to simulate the qualityof press proofs. There are three known types of photographic colorproofing methods, namely, the surprint type, the overlay type and thetransfer type.

In the overlay type of color proofing, an independent transparentplastic support is used for producing an image of each color separationfilm. A number of such supports carrying colored images are thensuperimposed upon each other and placed on a white sheet to produce acolor proof. Advantages are that it is quick and can serve as aprogressive proof by combining any two or more colors in register.

In the surprint type of color proofing method, a color proofing sheet isprepared by successfully producing images of different colors fromdifferent color separation films onto a single receptor sheet. This isdone by utilizing a single opaque support and by applying toners,photosensitive solutions or coatings of photosensitive materials ofcorresponding colors on the opaque support in succession. An example ofthis approach is described in U.S. Pat. No. 3,671,236. An advantage ofthe surprint type of color proof is that the color saturation is notinfluenced by superimposed plastic supports. This method more closelyresembles actual printing and eliminates the color distortion inherentin overlay systems.

Various processes for producing copies of an image embodyingphotopolymerization and thermal transfer techniques are known as shownin U.S. Pat. Nos. 3,060,023; 3,060,024; 3,060,025; 3,481,736; and3,607,264. In these processes, a photopolymerizable layer coated on asuitable support is imagewise exposed to a photographic transparency.The surface of the exposed layer is then pressed into contact with theimage receptive surface of a separate element and at least one of theelements is heated to a temperature above the transfer temperature ofthe unexposed portions of the layer. The two elements are thenseparated, whereby the thermally transferrable, unexposed, image areasof the composite transfer to the image receptive element. If the elementis not precolored, the tacky unexposed image may now be selectivelycolored with a desired toner. The colored matter preferentially adheresto the clear unpolymerized material. U.S. Pat. No. 3,574,049 provides atransfer process for printing a design on a final support whichcomprises (a) printing a design onto a temporary support, (b)superimposing the temporary support and the final support, (c) applyingheat and/or pressure to the superimposed structure formed in (b), and(d) separating the temporary support from the final support whichretains the printed design. The affinity of the design for the temporarysupport is lower than its affinity for the final support.

In U.S. Pat. No. 3,721,557, a method of transferring colored images isclaimed which provides a stripping layer coated between thephotosensitive element and the support. When the photosensitive layer isexposed to actinic light and developed, the more soluble portions areselectively removed to produce a visible image. The image-carryingsupport is pressed against a suitable adhesive coated receptor memberand, subsequently, the carrier support sheet is stripped to accomplishthe transfer of the image. A fresh layer of adhesive is applied to thereceptor for each subsequent transfer.

This invention employs a water soluble diazonium salt which in thepreferred embodiment is a polycondensation product of3-methoxy-4-diazodiphenylamine sulfate and 4,4'-bis-methoxymethyldiphenylether precipitated as the chloride salt or the methane sulfonicacid salt, formulated with various water soluble and certain waterinsoluble but swellable resins to prepare a completely water developableoverlay or, when overcoated with adhesive and transferred by lamination,a one piece proofing film. Additionally, since the preferred formulationutilizes water insoluble, water swellable resin binders, the films havethe advantage of excellent fingerprint resistance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic view of the structure of an overlay colorproofing system according to this invention.

FIG. 2 shows a schematic view of the structure of a transfer type colorproofing system according to this invention.

SUMMARY OF THE INVENTION

The invention provides a color proofing film and method for forming acolored image which comprises:

A) providing a negative working, photosensitive, overlay color proofingfilm which comprises, in order:

i) a transparent, preferably adhesion promoted substrate; and

ii) a photosensitive layer on said substrate, which photosensitive layercomprises a light sensitive, water soluble, negative working, polymericdiazonium compound, which diazonium compound is present in sufficientamount to photosensitize said layer; and a water insoluble, waterswellable binder resin in sufficient amount to bind the layer componentsin a uniform film; and at least one colorant in sufficient amount touniformly color said layer; and then

B) imagewise exposing said photosensitive layer to sufficient actinicradiation to form a latent image; and then

C) developing said film with water.

In the most preferred embodiment the diazonium compound is thepolycondensation product of 3-methoxy-4-diazodiphenylamine sulfate and4,4'-bis-methoxymethyl diphenylether precipitated as the chloride saltor the methane sulfonic acid salt.

The invention also provides a color proofing film and a method forforming a colored image which comprises:

A) providing a negative working, photosensitive, transfer color proofingfilm which comprises, in order:

i) a substrate having a release surface; and

ii) a single, colored photosensitive layer on said release surface,which photosensitive layer comprises a light sensitive, water soluble,negative working, polymeric diazonium compound, which diazonium compoundis present in sufficient amount to photosensitize said layer; and awater insoluble, water swellable binder resin in sufficient amount tobind the layer components in a uniform film; and at least one colorantin sufficient amount to uniformly color said layer; and

iii) an adhesive layer on said photosensitive layer, which adhesivelayer comprises a major amount of a polymeric material and whichadhesive layer has a softening point in the range of from about 60° C.to about 180° C., and thereafter

B) either

i) laminating said element with heat and pressure via said adhesivelayer to a developer resistant receiver sheet; and removing saidsubstrate by the application of peeling forces; and imagewise exposingsaid photosensitive layer to actinic radiation; or

ii) imagewise exposing said photosensitive layer to actinic radiation;and laminating said element with heat and pressure via said adhesivelayer to a developer resistant receiver sheet; and removing saidsubstrate by the application of peeling forces; or

iii) laminating said element with heat and pressure via said adhesivelayer to a developer resistant receiver sheet; and imagewise exposingsaid photosensitive layer to actinic radiation; and removing saidsubstrate by the application of peeling forces; and

C) removing the non-exposed areas of said photosensitive layer withwater, which removing is conducted at a temperature at which saidadhesive layer is substantially non-tacky, and preferably

D) repeating steps A through C at least once whereby anotherphotosensitive element having at least one different colorant islaminated onto said receptor sheet over the non-removed portions of thepreviously laminated photosensitive layer or layers.

In the most preferred embodiment the diazonium compound is thepolycondensation product of 3-methoxy-4-diazodiphenylamine sulfate and4,4'-bis-methoxymethyl diphenylether precipitated as the chloride saltor the methane sulfonic acid salt.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In preparing the overlay version of this invention, one prepares aphotographic element which broadly comprises a transparent substrate anda colored photosensitive layer on it.

In carrying out the transfer version of the invention, one employs aphotographic element which broadly comprises a substrate having arelease surface, a colored photosensitive layer on the release surfaceand an adhesive layer on the photosensitive layer. Optional additionallayers containing anti-halation materials, adhesion promoters or releaseagents may also be used.

In the preferred embodiment, the substrate is composed of adimensionally and chemically stable base material which does notsignificantly change its size, shape or chemical properties as theresult of the heating, coating or other treatments which it mustundergo. One preferred material is polyethylene terephthalate. In theusual case it has a thickness of from about 1 to about 10 mils, a morepreferred thickness is from about 2-5 mils and most preferably fromabout 2-3 mils. Suitable films include Hostaphan 3000, available fromHoechst Celanese Corporation, Mylar D, available from DuPont and Melinexgrades 0; 052; 442; 516 and S, available from ICI. The surface of thesubstrate may be smooth or may be provided with a matte texture byvarious methods known in the art.

Matte films include Melinex 377 and 470 from ICI. These materials havethe unique property of giving the final image of the transfer version adesired matte finish without any extra steps. One can control the glossof the final image by properly selecting the matte finish of thetemporary support. This effect works because the top layer of the finalimage is originally in contact with this matte surface. This does notoccur with a separate release layer between the temporary support andphotosensitive layer. An additional advantage of coating on a mattesurface is that subsequent transferred layers generally adhere better toa rough surface than to a smooth surface.

A similar matte finish of the final image can be obtained by embossingthe shiny, top surface of the image with a matte material, such asdescribed above. This is done by laminating together the final image andmatte material under pressure and temperature. The matte material isthen generally removed after lamination. The advantage of this method isthat the finish of the final proof can be varied. Furthermore, thematting material can be used repeatedly.

A third method for producing a matte finish uses a heat transferablelayer such as Butvar 90 available from Monsanto, coated onto a film witha rough surface such as Melinex 329, available from ICI. The adhesivelayer is laminated to the final image under pressure and temperature.Then the film with the rough surface is peeled off. The rough surfaceimparts a matte finish to the final image. The advantage is that alllayers appear matte and that the extra adhesive layer protects theimage. U.S. Pat. Nos. 4,294,909 and 4,376,159 also suggest variousmethods for making a matte surface.

In the transfer case, the substrate must have a release surface, thatis, it must be capable of releasably holding the photosensitive layerthereto. This may be accomplished either by the substrate surface beinginherently releasable, being rendered releasable by a suitable treatmentor being provided with a release layer over the substrate surface. Sucha release layer may comprise polyvinyl alcohol.

Bonded to the substrate or the release surface is the photosensitivelayer. The photosensitive layer broadly comprises a photosensitizer, acolorant, a binding resin, and other optional ingredients such asplasticizers, acid stabilizers, surfactants, anti-static compositions,uv absorbers and residual coating solvents.

The photosensitizer is a light sensitive, water soluble, polymericdiazonium compound. In the most preferred embodiment the diazoniumcompound is the polycondensation product of3-methoxy-4-diazodiphenylamine sulfate and 4,4'-bis-methoxymethyl-diphenylether, precipitated as the chloride salt as taught inU.S. Pat. No. 3,849,392, which is incorporated herein by reference.Another preferred diazonium compound is the polycondensation product of3-methoxy-4-diazo diphenylamine sulfate and 4,4'-bis-methoxymethyldiphenylether precipitated as the methane sulfonic acid salt.

Suitable binding resins are water insoluble and water swellable. Waterinsoluble resins include those which are less than about 2% by weightsoluble in water. An important resin selection criterion is that it mustbe a good film former. The most preferred resins are polyvinyl acetatepolymers such as Mowilith 30 which is available from Hoechst AG and hasan average molecular weight of about 30,000; a polyvinylalcohol/polyvinyl acetate copolymer available as Gelvatol 20/30 fromMonsanto; a polyvinyl acetate/crotonic acid (95:5) copolymer having anaverage molecular weight of about 100,000, available as Mowilith CT-5from Hoechst AG. Carboset acrylic resins from B. F. Goodrich, Elvamidenylon multi-polymer resin from Dupont and Klucel, a partial propylmodified carboxymethyl cellulose available from Hercules are alsouseful.

The colorants useful for the present invention include various classesof dyes and pigments. In the most preferred embodiment, pigments havingan average particle size of about 1 micrometer or less are used.

Optional plasticizers which may be incorporated into the photosensitivelayer include those of the phthalate and phosphate types. Preferredplasticizers include dibutyl phthalate and dimethyl phthalate. Acidstabilizers include phosphoric acid and p-toluene sulfonic acid.

These ingredients may be blended with such compatible solvents asethanol, methyl cellosolve and methyl ethyl ketone, coated on therelease surface and dried. In the preferred embodiment, thephotosensitive layer has a coating weight between approximately 0.1 and5.0 g/m. The most preferred weight is from about 0.5 to 2.0 g/m.

In the preferred embodiment, the photosensitizer is present in thephotosensitive layer in an amount of from about 10 to about 70 percentby weight; or more preferably from about 20 to about 60 percent byweight.

In the preferred embodiment, the colorant is present in thephotosensitive layer in an amount of from about 5 to about 30 percent byweight; or more preferably from about 10 to about 20 percent by weight.

In the preferred embodiment, the binding resin is present in thephotosensitive layer in an amount of from about 5 to about 50 percent byweight; or more preferably from about 15 to about 35 percent by weight.

In the preferred embodiment, the plasticizer, when one is used, ispresent in the photosensitive layer in an amount of up to about 10percent by weight or more preferably at about 5 percent by weight.

In the preferred embodiment, the acid stabilizer, when one is used, ispresent in the photosensitive layer in an amount of up to about 10percent of the photosensitizer.

In the transfer version the adhesive layer comprises a polymericmaterial which is preferably polyvinyl acetate and may optionallycontain such other desired components as uv absorbers, anti-staticcompositions and plasticizers. Useful polyvinyl acetates non-exclusivelyinclude Mowilith DM-6, 20, DM-22, 25, 30 and mixtures thereof, availablefrom Hoechst AG. Other suitable polymers non-exclusively includepolyvinyl acetates, MOWILITH CT-5, as before described, polyvinylacetals such as Formvar, available from Monsanto and the vinylacetate/vinyl alcohol/vinyl acetal terpolymers described in U.S. Pat.No. 4,670,507 which is incorporated herein by reference. These areusually dispersed in water, or dissolved in methyl isobutyl ketone orn-butyl acetate or other solvent compositions for coating on thephotosensitive layer. It is then dried to a coating weight of from about5 to about 30 g/m², more preferably from about 10 to about 20 g/m². Thelayer may optionally contain a uv absorber such as Uvinul D-50 from GAF.It may also contain a plasticizer such as Resoflex R-296, available fromCambridge Industries. It may also contain antistats, such as Gafac andGafstat from GAF. It may also contain other resins, such asNitrocellulose RS 1/2, available from Hercules. The adhesive layershould not be tacky to the touch, during storage or during developmentof the photosensitive element. The layer should have a softening pointin the range of from about 40° C. to about 180° C., preferably 60° C. to120° C., more preferably 60° C. to 100° C. In the preferred embodiment,the polyvinyl acetate is present in the adhesive layer in an amount ofgreater than about 50 percent by weight. The plasticizer may be presentin an amount of up to about 30 percent by weight, the uv absorber up toabout 20 percent by weight, and other resins up to about 50 percent byweight.

Typical adhesive formulations include:

I.

Water 50.00

Mowilith DM-22 50.00

II.

n-butyl acetate 78.00

Resoflex R-296 1.00

Mowilith 25 21.00

III.

n-butyl acetate 68.70

Uvinul D-50 1.30

Mowilith 20 30.00

In operation in the transfer mode, the photosensitive element islaminated to a receptor sheet via the adhesive layer. The receiver sheetshould be resistant to any adverse effects which may be caused by thedeveloper of choice. For example, the receiver sheet should be waterresistant if aqueous developers are used. Plastic or plastic coatedreceiver sheets are useful for this purpose.

Useful receiver sheets include Melinex 329, 339, 994 and 3020 from ICI.Other white and non-white receiver sheets may also be used. Roughtextured and/or adhesion promoted surfaces are preferred for thereceiver, which must be able to withstand the laminating and developmentprocesses.

Lamination may be conducted by putting the receiver sheet in contactwith the adhesive side of the colored composite and then introducing thetwo materials into the nip of a pair of heated laminating rollers undersuitable pressure. Suitable laminating temperatures usually range fromabout 60° C. to about 90° C., preferably about 75° C. to about 85° C.After lamination, the substrate is peeled away, usually merely employingmanual peeling forces. The adhesive and photosensitive layers thusremain on the receiver sheet.

The photosensitive layer is imagewise exposed by means well known in theart either before or after lamination. Such exposure may be conducted byexposure to a uv light source through a photomask under vacuum frameconditions. Exposure may be performed with actinic light through aconventional negative flat. Exposures after lamination and peel apartare preferred for emulsion-to-emulsion contact. Mercury vapor dischargelamps are preferred over metal halide lamps. Filters may be used toreduce light scattering in the material.

After lamination, peel apart and exposure, the photosensitive layer isdeveloped by dissolving the non-exposed area in a water developer anddried. The adhesive layer is not removed by this development.

The process can then be repeated whereby another photosensitive elementhaving a different color is laminated to the same receiver sheet overthe previously formed image. In the usual case, four colored layers areemployed to produce a full color reproduction of a desired image. Theseare cyan, magenta, yellow and black.

In the overlay version, the photosensitive layer on the substrate isexposed as above and developed with water. A colored image appears onthe transparent substrate. In the usual case four such films, eachbearing a different colored image, are produced. They are held over oneanother in register over an opaque background sheet. A full color imagemay thereby be examined. In the overlay version the substrate ispreferably adhesion promoted by means well known in the art, such asthat method taught in U.S. Pat. No. 4,157,918 which is incorporatedherein by reference.

To further explain the operation of the overlay version of theinvention, reference is now made to FIG. 1. A transparent substrate 2 iscoated with photosensitive layer 4. This composite is exposed to actinicradiation through color separation negative 6. This produces exposedarea 4' of layer 4. Upon development with water, the unexposed portionof layer 4 is removed and only image portion 4' remains on substrate 2.

In the transfer mode, reference is made to FIG. 2 which explains oneprocessing sequence. Temporary substrate 10 is coated with coloredphotosensitive layer 4 and adhesive layer 8. This construction is thenlaminated to a receiver sheet 12 via the adhesive 8 and the temporarysubstrate 10 is peeled away. After exposure and development of thephotosensitive layer with water, exposed image 4' is positioned on theadhesive/substrate composite.

The following non-limiting examples serve to illustrate the invention:

EXAMPLE 1

30 grams of Elvamide (nylon multi-polymer resin from Dupont) aredissolved in 640 g of ethanol and 160 g of water with slight heating.This is mixed with 1.1 g of the polycondensation product of3-methoxy-4-diazodiphenylamine sulfate and 4,4'-bis-methoxymethyldiphenylether precipitated as the chloride salt dissolved in 20 gmethanol and 20 g of water. Then 0.45 g. Calcozine Yellow dye is added.The solution is coated onto Melinex 505 adhesion promoted polyester film(available commercially from ICI) at 750 mg/m² coating weight. Sample isthen dried at 100 C. for 1 min. The sample is exposed with metal halidelight source for 10 seconds through a negative test flat and developedwith tap water giving a usable lithographic image on the sheet.

EXAMPLE 2

Example 1 is repeated except the water soluble diazonium salt used isthe polycondensation product of 3-methoxy-4-diazo diphenylamine sulfateand 4,4'-bis-methoxymethyl diphenylether precipitated as the methanesulfonic acid salt. The exposed material can be developed by sprayingwith tap water.

EXAMPLE 3

Example 1 is repeated except Klucel (partial propyl modifiedcarboxymethyl cellulose) is used as the water insoluble but swellableresin and Victoria Pure Blue dye is used as the colorant. The imagedfilm can be developed by a tap water spray.

EXAMPLE 4

Example 3 is repeated except the polycondensation product of3-methoxy-4-diazo diphenylamine sulfate and 4,4'-bis-methoxymethyldiphenylether precipitated as the methane sulfonic acid salt is used.The imaged film can be developed by wiping with a cotton Webril wipe andwater alone as the developer.

EXAMPLE 5 (OVERLAY)

A resin binder stock solution is prepared by dissolving 30 g of Gelvatol20/30 (Polyvinyl alcohol/polyvinyl acetate copolymer) in 800 ml. of H₂ Oand adding 200 ml. of ethanol and 0.2 ml. Triton X-100. To 20 g. of thisstock solution, 20 g. of methanol, 0.45 g Calcozine yellow and 1.1 g. ofthe polycondensation product of 3-methoxy-4-diazo diphenylamine sulfateand 4,4'-bis-methoxymethyl diphenylether precipitated as the chloridesalt, are added and stirred until dissolved.

An aliquot is coated by Meir rod drawdown onto a Melinex 516 polyestersheet. After oven drying at 100° C. for one minute, the coated sheet isexposed in a Berkey-Ascor exposure light source through a negative mask.The sample could be spray developed with water giving excellentresolution including 6 micron lines of an UGRA target.

EXAMPLE 6 (TRANSFER)

To 25 g. of methyl Cellosolve and 25 g. of methanol are added 0.3 g.Mowilith CT-5 resin (polyvinyl acetate/crotonic acid: 95/5) followed byVictoria Cyan at 0.023 g. and Victoria Pure Blue at 0.35 g. Afterdissolving these dyes, 1.0 g. of the diazo of example 5 are dissolvedand the solution is coated onto Melinex ♀with a Meir rod. After ovendrying for one minute at 100° C., the color coat is overcoated withMowilith 30 (polyvinylacetate) to a coating weight of 10-12 g/m². Afterdrying at 100° C. for one minute, the coatings (color coat and adhesive)can be transferred by lamination at 165° F. to an adhesion promoted(acrylate) white receiver sheet (Melinex 3020). Exposure in a BerkeyAscor light source through a negative mask followed by water developmentgives excellent image contrast with good fingerprint resistance.

EXAMPLE 7

The coating solution of Example 5 is diluted 1:1 with a 50:50 mixture ofmethyl Cellosolve and methanol. An aliquot is coated with a Meir rodonto a polyester sheet. After air drying at 100° C. for one minute, thecoated sheet is exposed in a Berkey-Ascor exposure light source. Thesample could be spray developed with water, giving excellent resolutionincluding 8 microns of a UCRA test target.

EXAMPLE 8

The composition of Example 7 is 1:1 diluted with a 50:50 mixture ofmethyl Cellosolve and methanol and the steps are repeated. The sample isstill imageable with a resolution of at least 12 microns with a UCRAtest target.

What is claimed is:
 1. A negative working, photosensitive, overlay colorproofing film which comprises, in order:i) a transparent substrate; andii) a photosensitive layer on said substrate, which photosensitive layercomprises a light sensitive, water soluble, negative working, polymericdiazonium compound, which diazonium compound is present in sufficientamount to photosensitize said layer; and a water insoluble, waterswellable binder resin in sufficient amount to bind the layer componentsin a uniform film; and at least one colorant in sufficient amount touniformly color said layer;wherein upon imagewise exposure of saidphotosensitive layer to sufficient actinic radiation said film iscapable of being developed with water alone.
 2. The color proofing filmof claim 1 wherein the diazonium compound is the polycondensationproduct of 3-methoxy-4-diazodiphenylamine sulfate and4,4'-bis-methoxymethyl diphenylether precipitated as the chloride saltor the methane sulfonic acid salt.
 3. The color proofing film of claim 1wherein said substrate comprises polyethylene terephthalate.
 4. The filmof claim 1 wherein said photosensitive layer further comprises one ormore ingredients selected from the group consisting of plasticizers,acid stabilizers, antistatic compositions, uv absorbers and surfactants.5. The film of claim 1 wherein the photosensitizer is present in thephotosensitive layer in an amount of from about 10 to about 70 percentby weight of the layer.
 6. The film of claim 1 wherein the colorant ispresent in the photosensitive layer in an amount of from about 5 toabout 30 percent by weight.
 7. The film of claim 1 wherein the binderresin is present in the photosensitive layer in an amount of from about5.0 to about 50.0 percent by weight.
 8. The film of claim 1 wherein thebinder resin comprises one or more water insoluble, water swellablepolymers selected from the group consisting of a polyvinylalcohol/polyvinyl acetate copolymer, a polyvinyl acetate/crotonic acidcopolymer, polyvinyl acetate homopolymers, acrylic resins, nylon resins,and carboxymethyl cellulose resins.